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Films of PLLA/PHBV: Thermal, morphological, and mechanical characterization
Author(s) -
Ferreira B. M. P.,
Zavaglia C. A. C.,
Duek E. A. R.
Publication year - 2002
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.11334
Subject(s) - differential scanning calorimetry , thermogravimetric analysis , dynamic mechanical analysis , materials science , glass transition , scanning electron microscope , crystallinity , composite material , ultimate tensile strength , polymer blend , thermal analysis , polymer , chemical engineering , copolymer , thermal , physics , meteorology , engineering , thermodynamics
Blends of poly( L ‐lactic acid)/poly(3‐hydroxybutyrate‐ co ‐3‐hydroxyvalerate) (PLLA/PHBV), both semicrystalline polymers, were prepared in different compositions (100/0, 80/20, 60/40, 50/50, 40/60, 20/80, and 0/100) and characterized by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), scanning electron microscopy (SEM), polarized light microscopy (PLM), and tensile tests. Although PLLA/PHBV blends do not present clear phase separation by SEM, the analyses by TGA, DSC, and DMA showed that the PLLA/PHBV blends are immiscible. The cross sections observed by SEM showed that the morphology of the blends changes from porous to dense, due to the composition. DSC and DMA data showed two distinct glass transition and melting temperatures. However, the DMA analysis related to frequency variation showed partial molecular interactions between PHBV and PLLA. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 2898–2906, 2002